Re: Concurrency in Gnat 3.05?

[mfeldman@seas.gwu.edu (Michael Feldman)]

In article <JSA.96Jul22171928@alexandria>,
Jon S Anthony <jsa@alexandria> wrote:

>Yes, sure.  But, I think that in many ways what was being asked about
>and expected was the sort of behavior that OS threads implementations
>provide.  In particular, that an IO does not block _the program_, only
>the task.  From this perspective, while it might not matter wrt to the
>correctness of the program if this is true, it definitely matters wrt
>to the user of the program and its intended use and possibily even its
>usability.  So, whether it "matters" is not simply an issue of
>"correctness"...

Yes, this is a good point. The thread started with a question on GNAT/_DOS_,
in which I don't think the _threads_ implementation is non-blocking.
Such an implementation would be hard in DOS. 

This comes back to Dewar's answer about GNAT being built over whatever
threads support the OS provides.

Mike Feldman